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KSL TV NEAR DUGWAY PROVING GROUND, Tooele County – Every Wednesday morning in Utah's West Desert, volunteers armed with rifles have ventured into a herd of wild horses and fire away at the mustangs. It's not to hurt them. It's to give them a better shot at survival. "Because I love the horses," said Jessica Franzen explaining her role in what amounts to a long-running science experiment. It's aimed at resolving a decades-old controversy over the future of the picturesque mustangs. "I do love helping out," she said. "There's a huge need." The volunteers tried to maneuver themselves close enough to get a clean shot at the hindquarters of a wild mare. Instead of using gunpowder and bullets, their rifles used CO2 to fire a dart that packs a chemical punch. Each dart delivered a shot of PZP which makes a mare sterile, temporarily. One booster shot each year keeps her that way.